x=input()
x=int(x)
if x>=30:
    print('Yes')
else:
    print("No") x=input() x input() input x=int(x) x int(x) int x if x>=30:
    print('Yes')
else:
    print("No") x>=30 x 30 print('Yes') print 'Yes' print("No") print "No" x=input() input() x x=int(x) int(x) x
x=input()
x=int(x)
if x>=30:
    print('Yes')
else:
    print("No")